#include <iostream>
#include <algorithm>
#include <vector>
#include <deque>
#include <string>
#include <tuple>
#include <functional>
#include <numeric>
#include <cmath>
#include <iomanip>
#include <map>
#include <random>
//#include "toollib.h"
#define INT_MAX 2147483647
#define Loop(i, n) for(int i = 0; i < (int)n; i++)
#pragma warning (disable:4018)

using namespace std;
typedef long long int lint;

//***** Main Program *****

int main() {
	string s, t;
	cin >> s;
	cin >> t;
	s += t;
	int mode = 0, ret = 0, count = 0;
	Loop(i, s.length()) {
		if (mode == 0 && s[i] == 'o') {
			count = 1;
			mode = 1;
		}
		else if (mode == 1 && s[i] == 'o') {
			count++;
		}
		else if (mode == 1 && s[i] == 'x') {
			if (count > ret) ret = count;
			mode = 0;
		}
	}
	if (count > ret) ret = count;
	cout << ret << endl;
	return 0;
}